Cause : 1st G-function not allowed comes when the NC block which was read in contains an illegal 1st G function. The NC program number and NC block number in which the NC block decoder detected the error can be read out with the "output actual values - decoder error location" task.

1. MDI mode:Only G90 (absolute dimensions) or G91 (incremental dimensions) can be entered as the 1st G function. Only G91 is allowed for the roll feed version.
2. Automatic/single-block mode:Define a legal 1st G function according to the table (see the Programming Guide).